The influences of different switching mode of PWM are discussed . Then a practical method three-state algorithm of invariable duty cycle under forced output mode is brought out to eliminate the commutation dead band generated by switching among the output interfaces of PWM waveform .

详细分析了PWM脉冲的不同切换方式对 电机 换 相控制的影响，提出消除 换 相死区的具体算法&强迫输出方式 下的2001年上海大学博士学位论文三状态恒定占空比算法。

The accurate rotor position is required while a brushless DC motor ( BLDCM ) is under commutation and control . However the fixing of position sensors is believed to difficult .

无刷直流电机 的 换 相和控制都需要准确的转子位置信息，而安装转子位置传感器是较困难的。

The dynamic performances of the DC system itself are analyzed under the faults of converter station AC buses . Commutation failure and the dynamic process of DC control system and the recovery process of DC system are accurately simulated .

重点分析换流站交流母线故障 后直流系统本身的动态特性，精确模拟 换 相失败、直流控制系统的动态调节过程以及故障后直流系统的恢复过程。

In this paper an effective mathematical model for HVDC transmission system digital simulation under unbalanced commutation voltage is developed .

本文以 BPA 中国 版暂态稳定 程序为基础，提出了一种实用的不对称 换 相电压 下直流输电系统仿真数学模型。

The exact rotor position is required while a permanent magnet brushless servo motor ( PMBSM ) is under commutation and control . Howere position sensors have some fatal defects .

永磁无刷伺服电机 的 换相和控制都需要准确的转子位置信息，然而位置传感器有其难以克服的缺点。

This control scheme can greatly raise the motor power factor under the prerequisite of safe commutation and raising the overload capacity .

这种控制方案 在保证可靠 换 流及过载能力的前提 下，大大提高了电机功率因数。

The Transient Stability Simulation of AC-DC Hybrid Power System under Unbalanced Commutation Voltage

不对称 换 相电压 下交直流混合系统暂态稳定数字仿真研究